We have been given work of Riley. By looking at his work carefully, we have to identify the error. So let's start from beginning.

First line is just the question so there will be no error.
After that we try to factor denominators
STEP1: 
Factors are correct so no error in step1.
In step2, we have to find the common denominator which will be (x-2)(x-3)(x+3)
so that means she needs to multiply and divide 2nd term by (x-2)(x-3) while she multiplied by only (x-2). Which means she used wrong common denominator.
<u>Hence final answer will be "B. She used the wrong common denominator."</u>
The value of x in the equation 1 1/5 - x/3 = 9/10 is 9/10
<h3>Fraction</h3>
1 1/5 - x/3 = 9/10
- x/3 = 9/10 - 1 1/5
- x/3 = 9/10 - 6/5
-x/3 = 9-12 / 10
-x/3 = -3/10
- divide both sides by - 1/3
x = -3/10 ÷ - 1/3
= -3/10 × -3/1
x = 9/10
Learn more about fraction:
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x(3x+5) since we factorize it
Answer:
x = 9
Step-by-step explanation:
take -6 to the other side so you add it to 30 = 36
equation is now 4x = 36
divide 4/4 and 36/4
x = 9